Askateboarder wants to cross a large playground and notices that there are large shapes painted on its asphalt surface. one shape is a large circle that covers the entire playground. inscribed in that circle is a square, with one point at the skateboarder’s feet and the other at his destination. the surface is rough and, therefore, friction is present. what path does he follow in order to minimize the work done by nonconservative forces?

Suppose that two tanks, 1 and 2, each with a large opening at the top, contain different liquids. a small hole is made in the side of each tank at the same depth 1.57 m below the liquid surface, but the hole in tank 2 has 2.49 times the cross-sectional area of the hole in tank 1. (a) what is the ratio ρ1/ρ2 of the densities of the liquids if the mass flow rate is the same for the two holes? (b) what is the ratio rv1/rv2 of the volume flow rates from the two tanks? (c) at one instant, the liquid in tank 1 is 14.9 cm above the hole. if the tanks are to have equal volume flow rates, what height above the hole must the liquid in tank 2 be just then?

Which of the following describes how a microwave heats food

Which two statements are true about a system? a system is a group of objects analyzed as one unit. energy that moves across system boundaries is conserved there's only one way to define the boundaries of a system all systems are made by humans